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Hello,

I'm using Thunderbird in Debian GNU/Linux 13 (trixie).

Version: Mozilla Thunderbird 140.4.0esr

apt package: thunderbird/stable-security,now 1:140.4.0esr-1~deb13u1 amd64 [installed]

The last few weeks I started getting the problem that Thunderbird freezes, it stops responding and Debian (with the default gnome UI) shows a popup window saying "Thunderbird is not responding", then I wait for about 10 or 20 seconds, and then Thunderbird becomes responsive again.

Apparently Thunderbird is doing something that takes a long time (perhaps going through messages to index them for quicker search or something like that, I don't know), something that should be done in a background thread so that the program can remain responsive, but for some reason that heavy work is done by the main UI thread causing Thunderbird to become unresponsive.

This problem has gotten worse over the past few weeks, so I really want to do something about it before Thunderbird becomes completely useless. (At the moment I can still use Thunderbird for like 10 minutes in between the freezing, so it's not yet critical.)

How can I find out what Thunderbird is doing while the "Thunderbird is not responding" is shown?

For example, is it possible to configure some logging or performance profiling that would output to a file some information about where the program spends its time?

Other ideas about how to troubleshoot this?

Firefox runs in background even after menu quit option with clear all browser history (proper exit). Firefox heats my phone while using. I am using Android 13 phone.

Hello,

same issue as described here: https://support.mozilla.org/mk/questions/1487230 I use: 144.0.1 (aarch64) on macOS 26.0.1 (25A362) (MB Pro M1 Pro).

Hi My local folders disapear, and I got an sugestionfrom Toad-hall, that i followed: Renaming the folder names to shorter names and download from the oficial Thunderbird download. When i removed thunderbird and install agin it works by magic, but each time i close Thunderbird and open it again my local folders are diapeared Kind regards Ole Storm Mikkelsen

I left a review and was asked to post this here so here goes. Firefox on android is currently the highest user of power on my Google Pixel 8 android phone. From the battery usage data (since last full charge) Firefox has used: Screen time: 2hrs 33mins Background: 5hrs 46mins Totalling 19% battery usage. Even though I turned OFF allow app to run in background!! Before I turned this off, the battery usage was similar. In comparison: WhatsApp -the next highest- is: Screen time: 1hr 42mins Background: 17hrs 52mins Totalling 14% battery usage. With allow app to run in background ON.

The only thing I can think of causing this is the annoying (in my opinion) way that Firefox does not close down all open tabs when I close the app (by hitting the square control button and hitting clear all open apps button) are they still keeping Firefox running in the background as they refresh?

PLEASE add a setting to close all tabs when closing the app. When I close Firefox on my PC and then open it again, I don't get my old tabs, so it must be possible to do on android.

Will this fricking "The bookmarks and history system will not be functional" B.S. ever be fixed? Firefox didn't have this issue for years now for almost a year every time Firefox starts up on a cold boot I get this idiotic non-sense message!. I have to close the browser I JUST OPENED and reopen in. This error is pure B.S. as again cold boot, just launched there is NOTHING other than Firefox that might be accessing the various sql.db's...so if this message is to be believed Firefox is blocking Firefox from Firefox... FIX THIS!

Third Contact. A few questions in hoping to resolve this on-going issue of Firefox 144.0 crashing on my iPhone.: What is GitHub … never heard of it? Why should I trust it. How is my privacy secured? Why do I have to go to GitHub for a Firefox issue? What is Xcode? How do I get it? How do I connect to it? After many years with Firefox why is this happening? Can I back grade to the previous Firefox? As a long time Firefox user and Mozilla donor a worse case option is for us to scrub FireFox from all of our systems pending Firefox issuing a corrective up grade.

Hello. My tablet, has limited memory, due to its age. I am now finding that one of the main reasons why it is so slow is because whenever I open firefox, it opens multiple firefox processes which drain the memory and in some cases crashes the system. I have followed all the advice given to reduce these multiple processes, however nothing seems to work and at least 6-8 firefox processes open each time I open it. I have unchecked the recommended performance settings as well as hardware acceleration boxes. However, I cannot find where to set the content process limit to 1. Please tell me how to do this and if there anything else I can try to stop it opening multiple processes or I may be forced to ditch Firefox altogether for an alternate such as Bing, Chrome or DuckDuckGo. Many thanks. Charlie

Firefox stürzt seit einigen Wochen immer wieder ab.

Auch ist es sehr langsam, oder lädt die Seiten nicht.

Auch kann ich nichts schreiben, zwischendurch.

Es nervt!

Und ein neues Update gibt es nicht.

Wenn es so weiter läuft, muss ich einen anderen Browser nehmen, was ich gar nicht möchte, da ich Firefox, seit Anfang an benutze...

This has been consistent for over a week now. One folder brings TB to a halt if I try to open any message in it. I have many folders and many I rarely open so I can't be sure it's just this folder but certainly all other folders seem fine and fast. This particular folder did have many messages in it but I deleted them all, accepting that I didn't really need them. I then repaired the folder but was a bit shocked to find the problem continues. The folder says it is 20.9Mb and that it contains three messages each of 7Mb. That's plausible as it just gets one Email per day from my server with some information. The size can vary quite a lot. I could just delete the folder and recreate one with the same filter rules, or I could delete the filter rules before doing that, or ... what?! Technical is that it is TB 140.3.1esr running on a fairly powerful Kubutu machine with 64Gb and really nowhere near any resource limits. It's pulling messages from the one IMAP server and, as I say, everything else seems fine. Any thoughts welcome, TIA, Chris

When I use Firefox to go to a url I have about 5 second max then it crashes. I’m running Firefox 144 on iOS 26.0.1. My wife is running Firefox 143.2 on iOS 26.0.1 and does not have this issue. Thanks. Mike

Just installed TB for Android on Samsung S24 Fe. Works fine but am unable to exit the application other than forcing phone back to home screen. Have installed on a Samsung tablet and the back button seems to be working OK. Anyone know of any issues with this phone and TB?

I use Thunderbird on Windows and on Mac. I'm wondering why the startup time on Mac is significantly longer on MacOS. I'm currently on Tahoe 26.0.1 but Thunderbird has always been a slow starter. Can I change any setting to remedy this. At the moment I have two mail accounts configured both Gmail.

I have nothing but problems with firefox since the last new updates. Sites hang, gmail can't be accessed, it takes 100x longer for sites to load, firefox uses huge amounts of memory and CPU, etc, etc.

I am so fedup spending valued worktime having to solve firefox issues each time they decide to make updates - which seems to be more and more frequent. How can I roll back to a previous version and permanently disable any further updates?

Each time I click on Firefox from the Windows 11 Task Bar, multiple versions of Firefox appear in the task manager (see photo). Some have an icon next to them that says "efficiency mode".

The attached screenshot is what I got from loading Firefox to ask this question. Multiple scans of my computer using Norton 360 -- including the Startup Scan -- have found nothing awry.

The operating system is Windows 11 Pro Edition Version 24H2 (OS Build 26,100.6584.) Firefox says it is fully up to date.

local folders after a certain amount of folders have disappeared. I have made a new folder today, it displayed, closed thunderbird, re-opened thinderbird, and folder disappeared, the .msl file and file are still in the profile/mail/localfolders directory, just not being display under local folders in program, deleted all .msl files, and restarted thunderbird, and it did not recreate the .msl file(s) as well

When Firefox ver. 143.0.4 (64bit) is opened, I see many tiny groups of black dots withing the whole of the desktop display of this Firefox. From these black dots I see coloured lines traveling across the desktop within the Firefox desktop display. As I move the mouse these coloured lined move, disappear, and move around. Can you offer any suggestions. I am using Ubuntu UALinux Gamepack 22.04, The version of Firefox is an upgrade provided by Firefox updates. I have tried to uninstall this version of Firefox, same effect occuring. I have manually deleted every referance to Firefox, as this worked in UALinux Gamepack 20.04. I have used sudo apt update, sudo apt upgrade, sudo apt --fix-broken install, and sudo dpkg --configure -a. None of these can fix this problem. I restarted my Firefox today with the same problem, and found in the Help dropdown menu, and found troubleshoot mode. When I opened in troubleshoot mode, all these problems are not there any more.

Can you offer any help ??????

P.S. I tryed to take a screenshot of this problem, but the screenshot doesn't show this problem ?